BEGIN; BEGIN EXPLAIN (ANALYZE, BUFFERS) select o_year, sum(case when nation = 'JORDAN' then volume else 0 end) / sum(volume) as mkt_share from ( select extract(year from o_orderdate) as o_year, l_extendedprice * (1 - l_discount) as volume, n2.n_name as nation from part, supplier, lineitem, orders, customer, nation n1, nation n2, region where p_partkey = l_partkey and s_suppkey = l_suppkey and l_orderkey = o_orderkey and o_custkey = c_custkey and c_nationkey = n1.n_nationkey and n1.n_regionkey = r_regionkey and r_name = 'MIDDLE EAST' and s_nationkey = n2.n_nationkey and o_orderdate between date '1995-01-01' and date '1996-12-31' and p_type = 'SMALL BURNISHED BRASS' ) as all_nations group by o_year order by o_year; QUERY PLAN ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Sort (cost=2174697.54..2174699.37 rows=731 width=38) (actual time=33928.716..33928.716 rows=2 loops=1) Sort Key: (date_part('year'::text, (orders.o_orderdate)::timestamp without time zone)) Sort Method: quicksort Memory: 25kB Buffers: shared hit=710212 read=295457 dirtied=376 written=3 -> HashAggregate (cost=2174649.98..2174662.77 rows=731 width=38) (actual time=33928.628..33928.630 rows=2 loops=1) Buffers: shared hit=710209 read=295457 dirtied=376 written=3 -> Nested Loop (cost=495993.13..2174161.74 rows=24412 width=38) (actual time=24861.594..33857.753 rows=24403 loops=1) Buffers: shared hit=710209 read=295457 dirtied=376 written=3 -> Nested Loop (cost=495993.13..2167199.43 rows=24412 width=16) (actual time=24861.522..33648.701 rows=24403 loops=1) Buffers: shared hit=661403 read=295457 dirtied=376 written=3 -> Hash Join (cost=495993.13..2160090.58 rows=24412 width=16) (actual time=24861.488..33219.581 rows=24403 loops=1) Hash Cond: (lineitem.l_orderkey = orders.o_orderkey) Buffers: shared hit=588051 read=295457 dirtied=376 written=3 -> Nested Loop (cost=0.00..1661842.74 rows=402120 width=16) (actual time=0.532..7002.179 rows=402888 loops=1) Buffers: shared hit=241835 read=229030 dirtied=376 -> Index Only Scan using part_p_type_p_partkey_idx on part (cost=0.00..46442.27 rows=13367 width=4) (actual time=0.430..263.180 rows=13399 loops=1) Index Cond: (p_type = 'SMALL BURNISHED BRASS'::text) Heap Fetches: 13399 Buffers: shared hit=522 read=11031 -> Index Scan using lineitem_l_partkey_l_quantity_l_shipmode_idx on lineitem (cost=0.00..120.54 rows=31 width=20) (actual time=0.047..0.487 rows=30 loops=13399) Index Cond: (l_partkey = part.p_partkey) Buffers: shared hit=241313 read=217999 dirtied=376 -> Hash (cost=484576.06..484576.06 rows=913365 width=8) (actual time=24859.233..24859.233 rows=911562 loops=1) Buckets: 131072 Batches: 1 Memory Usage: 35608kB Buffers: shared hit=346213 read=66427 written=3 -> Hash Join (cost=135786.46..484576.06 rows=913365 width=8) (actual time=5827.166..23250.316 rows=911562 loops=1) Hash Cond: (orders.o_custkey = customer.c_custkey) Buffers: shared hit=346213 read=66427 written=3 -> Bitmap Heap Scan on orders (cost=96755.84..419286.20 rows=4566824 width=12) (actual time=3447.990..8030.612 rows=4561956 loops=1) Recheck Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared hit=236163 read=30321 written=3 -> Bitmap Index Scan on orders_o_orderdate_o_orderkey_idx (cost=0.00..95614.14 rows=4566824 width=0) (actual time=3325.970..3325.970 rows=4570988 loops=1) Index Cond: ((o_orderdate >= '1995-01-01'::date) AND (o_orderdate <= '1996-12-31'::date)) Buffers: shared read=12456 -> Hash (cost=35280.62..35280.62 rows=300000 width=4) (actual time=2378.786..2378.786 rows=299838 loops=1) Buckets: 32768 Batches: 1 Memory Usage: 10542kB Buffers: shared hit=110050 read=36106 -> Nested Loop (cost=906.17..35280.62 rows=300000 width=4) (actual time=36.236..2160.933 rows=299838 loops=1) Buffers: shared hit=110050 read=36106 -> Hash Join (cost=1.07..2.47 rows=5 width=4) (actual time=0.052..0.125 rows=5 loops=1) Hash Cond: (n1.n_regionkey = region.r_regionkey) Buffers: shared hit=2 -> Seq Scan on nation n1 (cost=0.00..1.25 rows=25 width=8) (actual time=0.011..0.025 rows=25 loops=1) Buffers: shared hit=1 -> Hash (cost=1.06..1.06 rows=1 width=4) (actual time=0.022..0.022 rows=1 loops=1) Buckets: 1024 Batches: 1 Memory Usage: 1kB Buffers: shared hit=1 -> Seq Scan on region (cost=0.00..1.06 rows=1 width=4) (actual time=0.018..0.018 rows=1 loops=1) Filter: (r_name = 'MIDDLE EAST'::bpchar) Rows Removed by Filter: 4 Buffers: shared hit=1 -> Bitmap Heap Scan on customer (cost=905.09..6455.63 rows=60000 width=8) (actual time=38.992..409.500 rows=59968 loops=5) Recheck Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=110048 read=36106 -> Bitmap Index Scan on customer_c_nationkey_c_custkey_idx (cost=0.00..890.09 rows=60000 width=0) (actual time=28.064..28.064 rows=59968 loops=5) Index Cond: (c_nationkey = n1.n_nationkey) Buffers: shared hit=5 read=832 -> Index Scan using pk_supplier on supplier (cost=0.00..0.28 rows=1 width=8) (actual time=0.015..0.015 rows=1 loops=24403) Index Cond: (s_suppkey = lineitem.l_suppkey) Buffers: shared hit=73352 -> Index Scan using pk_nation on nation n2 (cost=0.00..0.27 rows=1 width=30) (actual time=0.005..0.005 rows=1 loops=24403) Index Cond: (n_nationkey = supplier.s_nationkey) Buffers: shared hit=48806 Total runtime: 33947.578 ms (64 rows) COMMIT; COMMIT